【摘要】 经过土壤样品的采集、分析和统计并与第2次土壤普查结果比较,20年间聊城市土壤耕层养分已发生较大变化,有机质、全氮、速效磷含量增加,变异系数亦增加;碱解氮含量增加,变异系数减小;速效钾含量减少,变异系数增加。其中速效磷含量增加明显,速效钾、速效磷变异系数增加明显。根据野外调查和统计资料,分析了上述变化的原因及其对农业生态安全的影响,提出了相应的土壤资源持续利用措施。更多还原

【Abstract】 Soil nutrients are important to crop growth. It is a matter of great significance in researching on the changes of soil nutrients in cultivated horizon and sustainable usage in Liaocheng city because it is important cash grain and cotton production base. From sampling, analysis, statistic and comparison to the second general detailed soil survey, the results showed that soil nutrients were greatly changed, which organic material, total nitrogen, active phosphorus contents and its variance coefficient, and alkali-hydrolyzable nitrogen were increased; and the variance coefficient of alkali-hydrolyzable nitrogen and active potassium were decreased. The increase of active phosphorus content, variance coefficient of active phosphorus and active potassium were most obvious. The reasons of changes were analyzed based on the field investigation and statistics, and the countermeasures to sustainable usage of soil resource were also put forward.更多还原